Rapid7 offers legitimate trials that allow you to scan a limited number of IPs with full functionality.

Using a "patched" or "cracked" version of a security tool like Nexpose carries extreme risks that often outweigh any perceived cost savings:

A comparative analysis of Nessus and NeXpose reveals several differences between the two tools:

To accurately determine if a patch is applied (rather than just guessing based on a version banner), Nexpose must log into the target system. Set Credentials

Nexpose is a comprehensive vulnerability assessment tool that helps organizations identify and prioritize security risks in their networks, systems, and applications. It provides detailed reporting and remediation guidance to help mitigate identified vulnerabilities.

The most straightforward and legal way to use Nexpose is by purchasing a license. This not only gives you full access to the software but also entitles you to support and updates.